EP0762231A2 - Appareil de développement comprenant des moyens de transport de développateur utilisant l'action d'un champ électrique - Google Patents

Appareil de développement comprenant des moyens de transport de développateur utilisant l'action d'un champ électrique Download PDF

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Publication number
EP0762231A2
EP0762231A2 EP96113496A EP96113496A EP0762231A2 EP 0762231 A2 EP0762231 A2 EP 0762231A2 EP 96113496 A EP96113496 A EP 96113496A EP 96113496 A EP96113496 A EP 96113496A EP 0762231 A2 EP0762231 A2 EP 0762231A2
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EP
European Patent Office
Prior art keywords
developer
image carrier
carrying
recovering
developing apparatus
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP96113496A
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German (de)
English (en)
Other versions
EP0762231A3 (fr
Inventor
Chiseki C/O Nec Corporation Yamaguchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Publication of EP0762231A2 publication Critical patent/EP0762231A2/fr
Publication of EP0762231A3 publication Critical patent/EP0762231A3/fr
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer

Definitions

  • the present invention relates to a developing apparatus, to be installed in an image forming system such as an electronic image forming apparatus or a printer, for developing electrostatic latent images formed on an image carrier such as a photosensitive element by using toner or any other powdered developer, and more particularly to a developing apparatus with means to carry powdered developer by utilizing the action of an electric field curtain.
  • the grouped electrodes for generating the action of an electric field curtain connect to a three-phase A.C. power source 12 via lines 13.
  • the electrode plate 10 is arranged in the opening, facing the photosensitive drum 11, of a storing section 15 in which a developer 14 such as toner is stored.
  • a conventional developing apparatus disclosed in the Gazette of the Patent Laid-open No. 63-13072 is provided with a photosensitive drum 21 and a developing sleeve 22, which is a rotating body arranged opposite, and supplies a developer 20, to the photosensitive drum 21.
  • a magnetic substance is arranged inside the developing sleeve 22.
  • This developing apparatus is further equipped with a storing section 23 which holds the developing sleeve 22 in an opening and stores the developer 20.
  • a toner feeding hopper 24 is also installed at the center of the ceiling part of the storing section 23.
  • a feeder 25 for intermittent feeding of the developer 20 is further arranged at the junction between the hopper 24 and the storing section 23.
  • a repulsion type electric field curtain generating mechanism which is driven by a two-phase A.C. power source 28. This mechanism is designed to be able to feed the developing sleeve 22 with the developer 20 while stirring it.
  • a blade 26 is provided at the opening of the storing section 23 to adjust the adhering quality of the developer 20.
  • a developer recovering section 27 receives the developer 20 supplied from the toner feeding hopper 24 and recovers the unused developer 20 adhering to the developing sleeve 22, and stores them into the storing section 23. In this recovering section 27, too, is laid a repulsion type electric field curtain generating mechanism driven by the power source 28. Further, a bias power source 29 is connected to the developing sleeve 22.
  • This process causes the newly fed and recovered developer 20 to be stored into the storing section 23 while the newly fed developer 20 is being electrified.
  • This conventional developing apparatus involves the problems of complexity, large size and high cost of the hardware because the developer is carried and recovered by a mechanical device using a rotating body.
  • a conventional developing apparatus disclosed in the Gazette of the Patent Laid-open No. 60-115962 has a toner carrier 32 which is arranged opposite to a photosensitive drum 31 at a certain distance and with an inclination and provided with a piezoelectric oscillator.
  • a toner supplying section 34 to supply a developer 30 to the toner carrier 32 is arranged above the toner carrier 32.
  • a toner storing section 33 stores the developer 30 which drops from the toner carrier 32 and is recovered.
  • Electric field curtain type developer carrying means 35 and 36 for supplying the developer 30 to the toner supplying section 34 are provided in the toner storing section 33.
  • a toner layer forming blade 37 is intended to regulate the quantity of the developer 30 supplied from the toner supplying section 34.
  • the developer 30 is supplied from the toner supplying section 34 to the developing toner carrier 32.
  • This toner carrier 32 makes the supplied developer 30 more readily adherable to the photosensitive drum 31 by causing a piezoelectric oscillator to oscillate in response to the application of a high frequency voltage.
  • the balance between an electrostatic latent image on the photosensitive drum 31 and an electrostatic force due to the electrification of the toner enables the developer 30, while falling over the slope of the toner carrier 32, to develop the electrostatic latent image on the photosensitive drum 31.
  • This conventional developing apparatus as its developing process relies on the electrostatic balance occurring on the photosensitive drum according to gravity, toner oscillation and the electric charge of the toner, is extremely sensitive to changes in developing environment.
  • a developing sleeve 42 which is a rotating body, is arranged opposite to a photosensitive element 41.
  • This developing sleeve 42 is accompanied by a feeder 44 for feeding a developer 40 from a toner supplying section 43, and this feeder 44 is provided with a mechanism to generate an electric field curtain action.
  • two sheets 45 and 46 having grouped electrodes for generating the electric field curtain action are arranged opposite to each other, and the feeder 44 is configured so as to apply an A.C. voltage from a three-phase A.C. power source 47 to each of the sheets 45 and 46.
  • a bias power source 48 is connected to the developing sleeve 42.
  • the developer 40 fed between the two sheets 45 and 46 for generating the electric field curtain action is carried toward the developing sleeve 42 while being subjected to repeated attraction and repulsion by the electric field curtain action generated by the sheets 45 and 46.
  • the developer 40 has an effect to make coagulated particles break one another by the electric field curtain action, and is thereby carried smoothly to the developing sleeve 42.
  • the developer 40 which is not used in the developing process is recovered into a toner recovering case 49.
  • This conventional developing apparatus inevitably involves the problems of large size, complexity and high manufacturing cost, since it comprises the developing sleeve which is the rotating body. Moreover, there is no mechanism to positively recover developer.
  • Patent Laid-open No. 3-15875 discloses another conventional developing apparatus, which has separate electric field curtain generating mechanisms for the developer carrying and developing purposes.
  • Still another conventional developing apparatus is disclosed in the Gazette of the Patent Laid-open No. 5-94084.
  • This apparatus has a developing sleeve and a developer storing section, and grouped electrodes are arranged to generate an electric field curtain action in the developer storing section or the developing sleeve.
  • the grouped electrodes to generate the electric field curtain action are divided into first and second groups of electrodes, which are stacked in two unparallel layers around the developer storing section or the developing sleeve, one on the inner side and the other on the outer side.
  • An object of the present invention is to provide a developing apparatus which can be realized in a small and thin configuration.
  • Another object of the invention is to provide a developing apparatus capable of improving the reliability of the developing process in an image forming system.
  • a developer storing section 102 is provided at a prescribed distance from a drum-shaped image carrier 101, which may be a photosensitive drum for example.
  • the developer storing section 102 is arranged in a position lower than the image carrier 101, which incidentally need not be drum-shaped but may be belt-shaped.
  • the carrying path 103 is formed in a plate shape having a prescribed width, and inclined from the image carrier 101 side toward the developer storing section 102 arranged in a lower position than the image carrier 101.
  • the carrying path 103 is bent toward the developer storing section 102, and the part of the carrying path 103 beyond the bend toward the developer storing section 102 is inclined more steeply than the rest of the carrying path 103.
  • a plurality of electrodes 201 (Fig. 6) for generating an electric field curtain over the surface of the carrying path 103 on which the developer 100 is carried.
  • the carrying path 103 has a configuration in which a stacked insulating layer 203 is formed over a supporting substrate 202 formed of either metal or resin.
  • a plurality of groups of three electrodes 201 each, which generate the action of an electric field curtain, are consecutively buried within the insulating layer 203.
  • the electrodes 201 are formed of wires or thin sheet members.
  • an electric field curtain which travels upward from the bottom of the carrying path 103, i.e. from the developer storing section 102 toward the image carrier 101, is generated over the surface of the carrying path 103.
  • This arrangement enables the developer 100 to be carried upward, i.e. toward the developing position on the image carrier 101 side, while being stirred and charged by the action of the electric field curtain.
  • a developing electrode section 106 At the end of the carrying path 103 toward the image carrier 101 is provided a developing electrode section 106, opposite to the image carrier 101 and directed downward.
  • the developing electrode section 106 is arranged in a position at a few millimeters' distance to the image carrier 101 at the end of the carrying path 103.
  • a developing bias for generating a developing electric field is constantly fed to the developing electrode section 106 from a developing power source 107.
  • the developing electrode section 106 consists of metal, and its surface is coated with a thin film or otherwise appropriately treated to facilitate smooth carriage of the developer 100 and to prevent the developer 100 from adhering to its surface.
  • the recovering path 104 has a configuration in which a vibrating mechanism having a ceramic-stacked piezoelectric element 304 is arranged between electrodes 302 and 303 over a sheet-shaped supporting substrate 301 formed of either metal or resin, and is arranged underneath and substantially in parallel to the carrying path 103.
  • the vibrating mechanism is intended to vibrate the recovering path 104.
  • the recovering path 104 When a prescribed high frequency voltage is applied from a power source 108 to the electrodes 302 and 303 arranged to sandwich the piezoelectric element 304 inbetween, the recovering path 104, especially its top face side, is vibrated. This causes the developer 100a having dropped onto the recovering path 104 and been recovered move, while being properly vibrated, over the recovering path 104 downward, i.e. toward the developer storing section 102, into which it is recovered.
  • the developing electrode section 106 is caused by the application of a bias from the power source 107 to supply a voltage of the same electric polarity as that of the latent image formed on the image carrier 101.
  • a developer layer thickness regulating plate 109 for regulating the layer thickness of the developer 100 carried from the developer storing section 102.
  • a recovery sheet 110 formed of a thin film of resin, such as urethane, to prevent the developer 100 from leaking out of the developer storing section 102.
  • the recovering path 104 is fitted to the developer storing section 102 via a seal pad 111 formed of porous resin.
  • Toner of 5 to 15 ⁇ m in grain size mainly consisting of styrene acryl or polyester resin is used as developer 100, and the image carrier 101 consists of an organic photo-semiconductor, so-called organic photosensitive material.
  • a prescribed three-phase A.C. voltage is applied from the power source 105 to the group of electrodes 201 which are arranged within the carrying path 103 and intended to generate an electric field curtain action.
  • the developer 100 in the developer storing section 102 is carried over the carrying path 103 toward the developer layer thickness regulating plate 109.
  • the developer 100 on the carrying path 103 undergoes layer thickness regulation by the developer layer thickness regulating plate 109, and is carried over the carrying path 103 further toward the developing electrode section 106.
  • the developer 100 is electrically charged as it is carried.
  • the developer 100 carried to the developing electrode section 106 jumps and adheres to the image carrier 101 to develop a electrostatic latent image thereon by a developing electric field formed between a surface charge on the image carrier 101 and a developing bias applied from the power source 107 to the developing electrode 106.
  • the latent image on the image carrier 101 is developed into a visible image the visible image is transcribed to a recording medium or the like.
  • the developer 100a which has not adhered to the image carrier 101 drops from the developing electrode section 106 and proceeds toward the recovering path 104.
  • the recovering path 104 Over the upper surface of the recovering path 104, which is inclined and vibrates as excited by a high-frequency voltage from the power source 108, the developer 100 is carried toward the recovery sheet 110, and recovered into the developer storing section 102.
  • the developer 100 recovered into the developer storing section 102 will be used for development again.
  • the operation of the developing apparatus thereafter continues by repeating the above-described sequence.
  • the peak-peak value V p-p is set appropriately somewhere between 1 volt (V) and 500 volts (V), and the frequency, between 1 kilohertz (kHz) and 50 megahertz (MHz), according to the shape of the piezoelectric element, the powder characteristics of the developer to be used, the shape of the recovering path, and the travelling speed of the developer among other factors.
  • the developing apparatus which is the first preferred embodiment of the present invention can carry the developer 100 and develop electrostatic latent images without using any mechanical power such as motor output. Furthermore, the use of the plate-shaped carrying path 103 and recovering path 104 to carry and recover the developer 100, respectively, has made it possible to substantially reduce the size of the mechanism to carry the developer 100 between the developer storing section 102 and the image carrier 101. Therefore, any image forming system equipped with the developing apparatus which is the first preferred embodiment of the invention can be made smaller and thinner as otherwise.
  • the possibility to adhere the developer 100 to the image carrier 101 and to recover the unused developer 100a without using any mechanical power makes the system easily and smoothly adaptable to any change in the developing process, such as the addition of a new function, optimization of the operation or any change in operating environment. Since the adjustment of the quantity of the developer 100 and the charging process of the developer 100 are smoothly accomplished by the electric field curtain action on the carrying path 103, the picture quality can be improved and stabilized. Accordingly, the image forming system using this developing apparatus can in itself be enhanced in reliability.
  • a developer storing section 402 is provided at a prescribed distance from a drum-shaped image carrier 401, which may be a photosensitive drum for example.
  • the image carrier 401 need not be drum-shaped, but may be belt-shaped.
  • the developer storing section 402 is arranged in a position about as high as and beside the image carrier 401.
  • a carrying path 403 for carrying a developer 100 from the developer storing section 402 to the image carrier 401 and a recovering path 404, provided below the carrying path 403, for recovering the unused developer 100a and returning it to the developer storing section 402.
  • the recovering path 404 is arranged substantially in parallel to the carrying path 103 and substantially horizontally.
  • the carrying path 403 is formed in a plate shape having a prescribed width, and arranged substantially horizontally from the image carrier 401 side toward the developer storing section 402.
  • the carrying path 403 is bent toward the developer storing section 402, and the carrying path 403 beyond the bend toward the developer storing section 402 forms a slope having a prescribed angle of inclination. This arrangement makes it easier for the developer 100 located at the bottom of the developer storing section 402 to be carried outward.
  • a plurality of electrodes for generating an electric field curtain over the surface on which the developer 100 is carried.
  • the carrying path 403 is provided with a supporting substrate 501 formed of metal or resin and an insulating layer 502 stacked on this supporting substrate 501.
  • a plurality of groups of three electrodes 503 each, which generate the action of an electric field curtain, are consecutively buried within the insulating layer 502.
  • the electrodes 503 are formed of wires or thin sheet members.
  • a vibrating mechanism consisting of a piezoelectric element 506 and its electrodes 504 and 505.
  • the carrying path 403 have a structure in which the carrying path 103 and the recovering path 104, respectively illustrated in FIGS. 6 and 7, are integrated.
  • An electric field curtain action which travels from the developer storing section 402 toward the image carrier 401, is generated by applying different phases of an A.C. voltage to the electrodes 503 buried in the insulating layer 502 from a power source 405, which is a three-phase A.C. power source.
  • the developer 100 is carried to the developing position of the image carrier 401 while being stirred and charged by the action of the electric field curtain.
  • the recovering path 404 has a similar stacked structure to that of the carrying path 403.
  • the power source 405 is connected to the electrodes 503 for generating the electric field curtain action so that the travelling direction of the developer is contrary between the carrying path 403 and the recovering path 404.
  • This can be readily realized by connecting the power source 405 so that the feeding sequences of the three-phase A.C. voltage are reverse to each other. Accordingly, the power source 405 for generating the electric field curtain is used as a common three-phase power source for the carrying path 403 and the recovering path 404.
  • a power source 408 for feeding a high-frequency power to the electrodes 504 and 505 of the vibrating mechanism are similarly shared by the carrying path 403 and the recovering path 404.
  • the carrying path 403 and the recovering path 404 are fitted to the developer storing section 402 via a seal pad 411 formed of porous resin.
  • the developer storing section 402 has a regulating plate 409, arranged near the carrying path 403, for regulating the layer thickness of the developer 100 carried over the carrying path 403.
  • a recovery sheet 410 is installed to prevent the developer 100 from leaking out of the storing section 402.
  • a developing electrode 406 At the end of the carrying path 403 toward the image carrier 401 is provided a developing electrode 406, opposite to the image carrier 401 and directed downward. a developing bias for generating a developing electric field is fed to the developing electrode 406 from a developing power source 407.
  • the developer 100a which has not been used in the development proceeds toward the recovering path 404, and recovered into the developer storing section 402 while being stirred by the action of the electric field curtain generated on the recovering path 404 and the vibration of the vibrating mechanism.
  • the recovered developer 100 will be used for development again.
  • the operation of the developing apparatus thereafter continues by repeating the above-described sequence.
  • respectively appropriate values are set for the outputs from the power sources to be applied to the electrodes in the carrying path 403 and the recovering path 404 under the same conditions as for the first preferred embodiment of the invention described above.
  • This second embodiment of the present invention makes it possible to reduce the overall size of the developing apparatus because the carrying path 403 and the recovering path 404 need not be inclined. Furthermore, the absence of adjustment, which would be needed to arrange the carrying path and the recovering path with inclinations contributes to the ease of production and maintenance.
  • a developer storing section 602 is provided at a prescribed distance from a drum-shaped image carrier 601, which may be a photosensitive drum for example.
  • the developer storing section 602 is arranged in a higher position than the image carrier 601.
  • the image carrier 601 need not be drum-shaped, but may be belt-shaped.
  • a carrying path 603 for carrying a developer 100 from the developer storing section 602 to the image carrier 601 and a recovering path 604, provided below the carrying path 603, for recovering the unused developer 100a and returning it to the developer storing section 602.
  • the carrying path 603, having a similar structure to the recovering path 104 shown in FIG. 7, is arranged with an inclination reverse to that of the carrying path 103 shown in FIG. 1 from the developer storing section 702 toward the image carrier 601 arranged underneath. Furthermore, as illustrated in FIG. 10, the carrying path 603 is bent so that its end toward the developer storing section 602 reach the bottom of the developer storing section 602. A high-frequency voltage supplied from a power source 605 is applied to electrodes buried in the carrying path 603.
  • a developing electrode 606 At the end of the carrying path 603 toward the image carrier 601 is provided a developing electrode 606, opposite to the image carrier 601 and directed downward. A bias voltage is fed to the developing electrode 606 from a developing power source 607.
  • the recovering path 604 has a similar structure to that of the carrying path 103 shown in FIG. 6.
  • the recovering path 604 is arranged substantially in parallel to the carrying path 603, and accordingly can successively recover the unused developer 100 which drops from the developing electrode section 606 and continuously carry it to the developer storing section 602.
  • an A.C. voltage is applied to electrodes buried in the recovering path 604 from a power source 608.
  • the developing apparatus which is this third embodiment of the present invention is provided with a developer layer thickness regulating plate 609, a recovery sheet 610 and a seal pad 611 as substantially similar constituent elements to their respective counterparts in the above-described first and second embodiments of the invention.
  • the output from the power source 605 is applied to the group of electrodes provided within the carrying path 603. Then the developer 100 in the developer storing section 602, passing between the carrying path 603 and the developer layer thickness regulating plate 609, is carried over the carrying path 603 toward the developing electrode 606 while being charged.
  • the developer 100 carried to the developing electrode 606 is used for development in a similar operation to that of the first preferred embodiment of the present invention, and an electrostatic latent image on the image carrier 601 is developed into a visible image.
  • the visible image is delivered to a process of transcription to a recording medium or the like.
  • the developer 100 which has not been used in the development drops from the developing electrode 606 onto the recovering path 604, and is recovered into the developer storing section 602 by the action of the recovering path 604.
  • the output from the power 608 is fed to the group of electrodes provided within the recovering path 604 to generate an electric field curtain action, and the action of the electric field curtain thereby generated causes the developer 100 on the recovering path 604 to pass under the recovery sheet 610 and to be recovered into the developer storing section 602.
  • the recovered developer 100 will be used again in the next round of development.
  • the operation of the developing apparatus thereafter continues by repeating the above-described sequence.
  • the third embodiment of the present invention can use the developer 100 in the developer storing section 602 efficiently and effectively because the developer 100 can be carrier out of the bottom of the developer storing section 602.
  • the present invention is not limited to the above-described embodiments thereof.
  • a belt- or sheet-shaped, instead of a drum-shaped, photosensitive or dielectric body may be used as image carrier.
  • the shape of the carrying path and the recovering path need not be flat, but may be curved if appropriate for the overall configuration of the apparatus.
  • the output of the power source to generate an electric field curtain action is not limited to a sine wave, but may be a triangular wave or a rectangular wave of a combination thereof.
  • the carrying path and the recovering path in the first or third embodiment of the invention may have the structure illustrated in FIG. 9.
  • the carrying path and the recovering path in the second embodiment of the invention may have the structure shown in FIG. 7.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Dry Development In Electrophotography (AREA)
  • Cleaning In Electrography (AREA)
  • Electrophotography Using Other Than Carlson'S Method (AREA)
EP96113496A 1995-08-30 1996-08-22 Appareil de développement comprenant des moyens de transport de développateur utilisant l'action d'un champ électrique Withdrawn EP0762231A3 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP7221949A JP2836537B2 (ja) 1995-08-30 1995-08-30 現像装置
JP221949/95 1995-08-30
JP22194995 1995-08-30

Publications (2)

Publication Number Publication Date
EP0762231A2 true EP0762231A2 (fr) 1997-03-12
EP0762231A3 EP0762231A3 (fr) 1999-08-25

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EP96113496A Withdrawn EP0762231A3 (fr) 1995-08-30 1996-08-22 Appareil de développement comprenant des moyens de transport de développateur utilisant l'action d'un champ électrique

Country Status (3)

Country Link
US (1) US5761591A (fr)
EP (1) EP0762231A3 (fr)
JP (1) JP2836537B2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003001303A1 (fr) * 2001-06-22 2003-01-03 Sharp Kabushiki Kaisha Dispositif de développement et dispositif de formation d'image
WO2003003126A1 (fr) * 2001-06-28 2003-01-09 Sharp Kabushiki Kaisha Dispositif de developpement et dispositif de formation d'images equipe dudit dispositif de developpement

Families Citing this family (16)

* Cited by examiner, † Cited by third party
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US6219515B1 (en) 1999-12-17 2001-04-17 Xerox Corporation Vibrating travel wave grid
US6597884B2 (en) * 2000-09-08 2003-07-22 Ricoh Company, Ltd. Image forming apparatus including electrostatic conveyance of charged toner
JP2002341656A (ja) * 2001-03-15 2002-11-29 Ricoh Co Ltd 静電搬送装置、現像装置及び画像形成装置
JP2002278274A (ja) * 2001-03-21 2002-09-27 Ricoh Co Ltd 静電搬送装置・静電搬送方法・画像形成装置
JP2002287495A (ja) * 2001-03-23 2002-10-03 Ricoh Co Ltd 静電搬送装置、現像装置、画像形成装置及び分級装置
JP3626119B2 (ja) 2001-06-27 2005-03-02 シャープ株式会社 現像装置およびそれを備える画像形成装置
JP3845593B2 (ja) * 2002-03-13 2006-11-15 株式会社リコー 分級装置、現像装置、画像形成装置、分級方法、現像方法及び画像形成方法
US6901231B1 (en) * 2002-03-25 2005-05-31 Ricoh Company, Ltd. Developing apparatus, developing method, image forming apparatus, image forming method and cartridge thereof
JP2004198744A (ja) * 2002-12-18 2004-07-15 Ricoh Co Ltd 静電搬送装置、現像装置、プロセスカートリッジ及び画像形成装置
JP4711088B2 (ja) * 2007-06-25 2011-06-29 ブラザー工業株式会社 現像剤供給装置及び画像形成装置
US8275298B2 (en) * 2009-06-01 2012-09-25 Brother Kogyo Kabushiki Kaisha Developer supply device
JP5510708B2 (ja) * 2010-01-20 2014-06-04 株式会社リコー トナー担持体、現像装置及び画像形成装置
JP5045775B2 (ja) * 2010-03-23 2012-10-10 ブラザー工業株式会社 現像剤供給装置
JP5408038B2 (ja) * 2010-05-31 2014-02-05 ブラザー工業株式会社 現像剤供給装置
JP5560939B2 (ja) * 2010-06-17 2014-07-30 ブラザー工業株式会社 現像剤供給装置
JP5375754B2 (ja) * 2010-06-18 2013-12-25 ブラザー工業株式会社 現像剤供給装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6312527A (ja) * 1986-07-03 1988-01-19 Canon Inc 電界カ−テン式粉体搬送装置
JPS6313068A (ja) * 1986-07-03 1988-01-20 Canon Inc 電界カ−テン現像装置
JPS6313075A (ja) * 1986-07-03 1988-01-20 Canon Inc 現像装置
US4994859A (en) * 1989-06-14 1991-02-19 Minolta Camera Kabushiki Kaisha Power cloud developing apparatus with a first and second electric field curtain generating means
US5027157A (en) * 1988-12-02 1991-06-25 Minolta Camera Kabushiki Kaisha Developing device provided with electrodes for inducing a traveling wave on the developing material
WO1993009476A1 (fr) * 1991-11-04 1993-05-13 Eastman Kodak Company Procede electrostatographique d'application de particules de toner
US5270484A (en) * 1990-09-14 1993-12-14 Canon Kabushiki Kaisha Powder conveying device

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS582853A (ja) * 1981-06-29 1983-01-08 Konishiroku Photo Ind Co Ltd 静電像現像方法
JPS5931979A (ja) * 1982-08-16 1984-02-21 Toshiba Corp 現像装置
JPS60115962A (ja) * 1983-11-28 1985-06-22 Olympus Optical Co Ltd 複写機の現像装置
JPS6313072A (ja) * 1986-07-03 1988-01-20 Canon Inc 現像装置
JPH01179177A (ja) * 1988-01-08 1989-07-17 Minolta Camera Co Ltd 現像装置
JP2840970B2 (ja) * 1990-01-23 1998-12-24 株式会社リコー 荷電粒子搬送装置及びこれを利用した画像形成装置
JPH0594084A (ja) * 1991-10-01 1993-04-16 Minolta Camera Co Ltd 現像装置
JP3090543B2 (ja) * 1992-08-05 2000-09-25 株式会社リコー 画像形成装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6312527A (ja) * 1986-07-03 1988-01-19 Canon Inc 電界カ−テン式粉体搬送装置
JPS6313068A (ja) * 1986-07-03 1988-01-20 Canon Inc 電界カ−テン現像装置
JPS6313075A (ja) * 1986-07-03 1988-01-20 Canon Inc 現像装置
US5027157A (en) * 1988-12-02 1991-06-25 Minolta Camera Kabushiki Kaisha Developing device provided with electrodes for inducing a traveling wave on the developing material
US4994859A (en) * 1989-06-14 1991-02-19 Minolta Camera Kabushiki Kaisha Power cloud developing apparatus with a first and second electric field curtain generating means
US5270484A (en) * 1990-09-14 1993-12-14 Canon Kabushiki Kaisha Powder conveying device
WO1993009476A1 (fr) * 1991-11-04 1993-05-13 Eastman Kodak Company Procede electrostatographique d'application de particules de toner

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
FREDERICK W. HUDSON: "DEVELOPMENT ARRANGEMENT" XEROX DISCLOSURE JOURNAL, vol. 3, no. 1, page 25 XP002106875 Stamford, Conn.,USA *
PATENT ABSTRACTS OF JAPAN vol. 012, no. 208 (M-709), 15 June 1988 -& JP 63 012527 A (CANON INC), 19 January 1988 *
PATENT ABSTRACTS OF JAPAN vol. 012, no. 216 (P-719), 21 June 1988 -& JP 63 013068 A (CANON INC), 20 January 1988 *
PATENT ABSTRACTS OF JAPAN vol. 012, no. 216 (P-719), 21 June 1988 & JP 63 013075 A (CANON INC), 20 January 1988 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003001303A1 (fr) * 2001-06-22 2003-01-03 Sharp Kabushiki Kaisha Dispositif de développement et dispositif de formation d'image
US6901232B2 (en) 2001-06-22 2005-05-31 Sharp Kabushiki Kaisha Developing apparatus and image forming apparatus using progressive wave electric field transport
WO2003003126A1 (fr) * 2001-06-28 2003-01-09 Sharp Kabushiki Kaisha Dispositif de developpement et dispositif de formation d'images equipe dudit dispositif de developpement
US6934496B2 (en) 2001-06-28 2005-08-23 Sharp Kabushiki Kaisha Developing device conveying toner using a traveling-wave electric field and image forming apparatus using same

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EP0762231A3 (fr) 1999-08-25
JP2836537B2 (ja) 1998-12-14
JPH0968864A (ja) 1997-03-11
US5761591A (en) 1998-06-02

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